NationMaster is a vast compilation of data from such sources as the CIA World Factbook, UN, and OECD. You can generate maps and graphs on all kinds of statistics with ease.
New York Public Library Digital Collections
A Search engine that searches wikis
Wikia is a community destination supporting the creation and development of wiki communities on any topic people are passionate about.
AltSearchEngine.com -A Day WiTHOUT Google!?!
Top 100 Alternative Search Engines - June Update
Search tags across Web 2.0 sites (Technorati, Deli.cio.us, Twitter,
Kosmix: Your Guide to the Web from Kosmix on Vimeo.